As we previously reported, Harding checked herself into a clinic in Arizona to seek help for depression and alcohol addiction, following her split from DJ Tom Crane.

Despite Sarah being 500 miles away from Chezza's base in Los Angeles, the Fight For This Love singer is said to have made the trip to seen Harding, even offering the 29-year old her LA apartment as a retreat.

A source told the Daily Star: "Cheryl is really concerned for her friend Sarah. She made time in her busy schedule to travel over to Arizona and visit her in the rehab centre."

"Cheryl feels really passionate about alcohol and drug abuse after years of worrying about her drug addict brother Andrew. Cheryl is now pulling out all the stops to help Sarah."

They continued: “She has told Sarah she is more than welcome to use her LA home as an escape pad when she comes out of rehab."

“A bolt-hole where Sarah can chill out and escape the London limelight and maybe try to save her relationship with Tom.”

Reports claim Harding has since extended her stint in rehab and will more than likely spend Christmas at the facility.